Extraction method of direct coal liquefaction residues and application of extracts

A technology of direct coal liquefaction and coal liquefaction residue, which is applied in the field of coal deep processing, can solve the problems that it is difficult to fully, rationally and efficiently utilize coal liquefaction to liquefy heavy liquefied oil, and achieve improved overall oil yield, convenient and safe operation, low cost effect

Active Publication Date: 2011-02-02
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve the purpose of fully, rationally and efficiently utilizing coal to liquefy heavy liquefied oil

Method used

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  • Extraction method of direct coal liquefaction residues and application of extracts
  • Extraction method of direct coal liquefaction residues and application of extracts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Add 100kg of coal direct liquefaction residue and 400Kg of the first extraction solvent (distillation range 220-260°C) into the stirred tank, and then make them fully mixed. Charge N 2 Gas to 2.0MPa, heat up to 180°C, and stir at a stirring speed of 200r / min for 30 minutes to obtain a mixture. Then pressurize and heat filter to obtain the extract mixture, send it to the atmospheric distillation tower, cut the fraction at 220-260°C, recover the first extraction solvent for recycling, and obtain 64.3Kg of the extract mixture at the bottom of the tower. The extract mixture was fully mixed with 300Kg of the second extraction solvent (distillation range 2 Gas to 0.5MPa, heat up to 140°C, stir at a stirring speed of 250r / min for 20 minutes to obtain the mixture, then perform cyclone centrifugation to obtain the upper layer extract mixture S2, send it to the atmospheric distillation tower, and cut out the -1 , gas-liquid ratio 700m 3 / t, the hydrogenation catalyst is Co-Mo / γ-...

Embodiment 2

[0072] 200kg of coal direct liquefaction residue and 600Kg of the first extraction solvent (distillation range 220-260° C.) were added into the stirred tank for thorough mixing. Charge N 2 Gas to 1.0MPa, heat up to 150°C, and stir at a stirring speed of 150r / min for 20 minutes to obtain a mixture. Then pressurize and heat filter to obtain the extract mixture, send it to the atmospheric distillation tower, cut the fraction at 220-260°C, recover the first extraction solvent for recycling, and obtain the extract mixture 112.1Kg at the bottom of the tower. The extract mixture and 300Kg of the second extraction solvent (distillation range 2 Gas to 1.5MPa, heat up to 100°C, stir at a stirring speed of 150r / min for 20 minutes to obtain the mixture, then conduct vacuum hot filtration and separation to obtain the extract mixture S2, send it to an atmospheric distillation tower, and cut off the distillate at -1 , gas-liquid ratio 900m 3 / t, the hydrogenation catalyst is Co-Ni-W / γ-Al 2...

Embodiment 3

[0075] Add 150kg of coal direct liquefaction residue and 500Kg of the first extraction solvent (distillation range 220-260°C) into the stirred tank, and thoroughly mix them. Charge N 2 Gas to 0.5MPa, heat up to 140°C, and stir at a stirring speed of 180r / min for 120 minutes to obtain a mixture. Then carry out pressurized hot filtration to obtain the extract mixture, send it to the atmospheric distillation tower, cut the fraction at 220-260°C, recover the first extraction solvent for recycling, and obtain 75.6Kg of the extract mixture at the bottom of the tower. The extract mixture and 250Kg of the second extraction solvent (distillation range 2 Gas to 1.5MPa, heat up to 110°C, stir at a stirring speed of 180r / min for 40 minutes to obtain the mixture, then pressurize and heat filter and separate to obtain the extract mixture S2, send it to the atmospheric distillation tower, and cut the -1 , gas-liquid ratio 1000m 3 / t, the hydrogenation catalyst is Co-Ni-W / γ-Al 2 o 3 , the ...

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Abstract

The invention relates to an extraction method of direct coal liquefaction residues and application of extracts. The extraction method comprises the following steps: a) adding coal liquefaction residue powder and a first extraction solvent to a stirred tank to undergo primary extraction; b) carrying out solid-liquid separation on the extracted mixture obtained in the step a) and recovering the first extraction solvent from the obtained liquid in a solvent recovery unit and recycling the first extraction solvent; c) obtaining extracts after recovering the first solvent and mixing the extracts with a second extraction solvent to undergo secondary extraction; d) carrying out solid-liquid separation on the extracted mixture obtained in the step c), obtaining heavy liquefied oil after recovering the second extraction solvent from the obtained liquid in the solvent recovery unit and then carrying out moderate hydrogenation on the heavy liquefied oil and other recycled solvents in a coal liquefaction solvent hydrogenation unit and using the product as the recycled solvent in the coal liquefaction process; and e) carrying out heat treatment on the asphaltic substances obtained in the step d) by heating and carbonizing to obtain mesophase asphalt and oils.

Description

technical field [0001] The invention relates to the field of coal deep processing, in particular to an extraction method of coal direct liquefaction residue and an application of the extract. Background technique [0002] Coal direct liquefaction is an advanced clean coal technology that converts coal directly into clean transportation liquid fuels (naphtha, diesel oil, etc.) or chemical raw materials through hydrogenation under the action of catalysts under high temperature and high pressure. One of the important ways of shortage and tight supply and demand of petroleum products. The main target product of the direct coal liquefaction process is liquefied oil, and by-products are some hydrocarbon gases, COx and other gases, process water, and liquefaction residues (also known as coal liquefaction residues) generated during the solid-liquid separation process. The liquefaction residue generally accounts for about 30% of the coal input. How to use this part of coal liquefac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/145C10G1/00C10C3/08C10C3/00C01B31/02C10G67/00
Inventor 吴秀章李克健张胜振舒歌平李丽
Owner CHNA ENERGY INVESTMENT CORP LTD
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